Highlighted rows differ between the two models.
| Specification | Tamron 18-200mm f/3.5-6.3 Di II VC - Monture Canon EF-S | Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical (IF) - Monture Canon EF-S |
|---|---|---|
| Mount | ||
| Mount | canon-ef-s | canon-ef-s |
| Optics | ||
| Focal (difference) | 18-200 mm | 17-50 mm |
| Aperture (difference) | f/3.5-6.3 | f/2.8 |
| Prime | No | No |
| Stabilization (difference) | Yes | No |
| Build | ||
| Weight (g) (difference) | 400,000 g | — |
Pick Model A if you need a single, lightweight all-in-one zoom for travel or casual shooting and can accept the dimmer f/6.3 tele end. Model B stays the better choice if you prioritize faster f/2.8 aperture for low-light work, sharper mid-range focal lengths, and don’t require telephoto reach.